An office chair includes three connecting element fixedly to a bottom of the seat for the back, the left armrest, and the right armrest to be detachably fitted to respectively; each of the back and the armrests has a support plate having several locating holes; the connecting elements allow respective support plates to be slid on; the support plates can't move up to separate from the connecting elements after having been slid onto the latter. Each of the connecting elements has a spring-loaded locating pin fitted thereto, which can be made to engage one of the locating holes of respective support plates to securely fix the support plates to the seat; thus, the back and the armrests can be adjusted in position, and can be detached from the seat for the chair to occupy less space in packing.

A child car seat includes a child-car-seat shell and an armrest. The armrest is attached to the shell. The armrest is adjustable for height at least between a first position and a second position.

An accessory chair apparatus for use with video games, the apparatus comprising a concave base, a seat portion, and a console. The base is shaped so as to facilitate a rocking motion in both a front to back and a side to side direction. However, body stabilizers may also to deployed as to prevent such rocking. The seat portion may include a back portion upon which a headrest may be adjustably mounted. The headrest may include at least one audio speaker mounted therein to enhance the game playing experience. The console is adjustably mounted on the front end of the base so as to ensure comfortable seating for occupants of various sizes. Also, a controller mounted frame may be placed on the console so as to accept a game controller, such as, for example, a steering wheel. The apparatus may also include a variety of storage compartments such as a basket, a case, and recesses in the body and the case.